Re: [PATCH] [RFC] travis-ci: remove bogus 'pyenv' in the Linux jobs

> In our test suite, when 'git p4' invokes a Git command as a
> subprocesses, then it should run the 'git' binary we are testing.
> Unfortunately, this is not the case in the 'linux-clang' and
> 'linux-gcc' jobs on Travis CI, where 'git p4' runs the system
> '/usr/bin/git' instead.
> 
> Travis CI's default Linux image includes 'pyenv', and all Python
> invocations that involve PATH lookup go through 'pyenv', e.g. our
> 'PYTHON_PATH=$(which python3)' sets '/opt/pyenv/shims/python3' as
> PYTHON_PATH, which in turn will invoke '/usr/bin/python3'.  Alas, the
> 'pyenv' version included in this image is buggy, and prepends the
> directory containing the Python binary to PATH even if that is a
> system directory already in PATH near the end.  Consequently, 'git p4'
> in those jobs ends up with its PATH starting with '/usr/bin', and then
> runs '/usr/bin/git'.